"Convex" definition HBR?

A

alinwa

oft dis'd member
I have some McMillan HBR stocks but I'm also setting up an HBR-legal setup using a Harris bipod. Can I legally compete using a front rest and riding the legs of the folded up Harris on the front rest? This stock IS NOT a typical HBR stock with the convex 2 1/2" width but a hunting stock with a folding bipod.

Can I fold the 'pod and run with it? Or must I remove the bipod and/or make a properly sized and weighted plate to replace it?
 
As long as the rifle makes the 10# weight limit and you can lift the rifle from the rest without the rest coming up with it your ok. However I would not do it because there is really no reason to have a bipod attached if your using a front rest, you certainly don’t want anything to hang up as the recoil pushes the rifle rearward on the front rest and rear bag.
 
OK, so my heavy 600 gun has holes drilled so I can fly little Marine Corps flags and a guy told me "you better not shoot a record because those attachments are in violation".....

Ask Bruce Bangemann about his swinging monkey talisman :)

I do not want to tune up the pod gun to find out it's illegal to shoot off the folded rails
 
alinwa said:
OK, so my heavy 600 gun has holes drilled so I can fly little Marine Corps flags and a guy told me "you better not shoot a record because those attachments are in violation".....

Ask Bruce Bangemann about his swinging monkey talisman :)

I do not want to tune up the pod gun to find out it's illegal to shoot off the folded rails
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The maximum fore end width, for a Hunter Rifle stock, is 2.25". I do not recall having read any limitations to attachments [to the stock] - only the barrel (NBRSA Hunter Rifle rules). I'd guess that the maximum width of the folded legs would have to comply with the 2.25" rule. The other concern could be the lack of convexity (is that a word?) one could argue that the contact surfaces are on the same plane, thus, not legal.

That said, it's probable that 99% of the stocks in use - going WAY back to the late 1980s - are not technically legal: "must be convex on ALL bottom surfaces" (my emphasis on all) - and most feature flat fore ends.:eek: Long ago, when I pointed this out, I was advised: "the curvature matches that of the earths surface . . . over a 2.25" length - i haven't done the math - that may be pretty flat. :p Keep 'em ON the X! RG

Addendum edit: Of course, this presumes that the attached bi-pod would be considered part of the stock, resting on the front bag, and NOT a rest, attached to the stock, which is not legal - plenty of room for interpretation here . . .;)
 
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R.G. Robinett said:
The maximum fore end width, for a Hunter Rifle stock, is 2.25". I do not recall having read any limitations to attachments [to the stock] - only the barrel (NBRSA Hunter Rifle rules). I'd guess that the maximum width of the folded legs would have to comply with the 2.25" rule. The other concern could be the lack of convexity (is that a word?) one could argue that the contact surfaces are on the same plane, thus, not legal.

That said, it's probable that 99% of the stocks in use - going WAY back to the late 1980s - are not technically legal: "must be convex on ALL bottom surfaces" (my emphasis on all) - and most feature flat fore ends.:eek: Long ago, when I pointed this out, I was advised: "the curvature matches that of the earths surface . . . over a 2.25" length - i haven't done the math - that may be pretty flat. :p Keep 'em ON the X! RG
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I'm worried one could argue that the folded legs are "rails". It won't be an issue until I win something...... I learned last time out that some of the old guys hate being beat by the brash loudmouthed newbie LOL :)

That THAT'S when the arguments start......

I'll build a plate with a convex radius, radius to be a chord of 42,2401,109ft
 
What I've always understood as to the definition of a convex stock is that if you can place a straight edge across the forend and if it will rock on the forend, that the stock is convex. As close to flat as you can get, but it meets the definition of convex. The NBRSA rules for lifting the rifle out of the front rest have been changed. It no longer has to do that and the front sandbag can lap over the top of the stock if its wanted. I'm not sure whether that applies to Hunter class or not. It does apply to the varmint classes. Just because you can do that, doesn't mean that its a good thing, but at least gives you that option.
 
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I think that this applies to all of the short range benchrest classes.
2.11.1.The front sandbag. The front shall be a bag, without additions, containing sand only, and at least 1⁄2” thick over its entire surface. The portion which contacts the rifle shall contact the entire surface under the fore end. Tape on the sandbag is legal.
 
Boyd Allen said:
I think that this applies to all of the short range benchrest classes.
2.11.1.The front sandbag. The front shall be a bag, without additions, containing sand only, and at least 1⁄2” thick over its entire surface. The portion which contacts the rifle shall contact the entire surface under the fore end. Tape on the sandbag is legal.
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OK.... so can one use a "Bull's Bag" or X-type bag for the front in HBR?

I've been told I cannot in regular group Bench Rest but how about HBR?
 
Hunter Stock

Looks to me that at least by IBS rules hunter stock can be flat or convex....

C) Rifles – Hunter and Varmint Hunter: 1) Hunter rifle stocks must conform to the requirements established for the Heavy Varmint rifle with the following additional requirements: a) The maximum width is 2.250 inches. b) Stocks must have a magazine area that will meet the magazine requirement for Hunter Class Rifles in VI.C.8 below.

Here is the heavy varmint rifle stock description from the current rule book

2) Heavy Varmint Rifle Any rifle having a safe manually operated firing mechanism, weighing not more than 13 1/2 pounds inclusive of sight, with a stock having a flat or convex forearm and total stock width not more than 3", having a toe formed by a straight line drawn from the toe of a substantially vertical butt with a 13 1/4 inch pull starting at a point at least 4 inches below the axis of the bore and extending forward to the centerline of the barrel at a point no more than 18 inches forward of the bolt face a barrel not less than 18 inches long, a diameter at and not more than 5 inches ahead of the bolt face of not more than
 
Al Nyhus said:
Get it shooting well with a normal setup.

Then, experiment. -Al
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I have a setup with a McMillan Hunter stock that shoots well but it's conventional. has all the problems inherent to changing angles in the front bags.

I made a stock with some dramatic changes...... and NO flat, a more conventional forend..... it seems to shoot better (easier) off a cradle bag than the normal one does off a Farley.

Well, it doesn't actually shoot any BETTER, but it never changes poi from position. The group never moves. I can walk the bag around on the forend and the group stays put. I don't know yet if this is truly important but it sure seems it could save some sighters, and it does shoot. Just would need some sort of custom bag setup to adapt it to the Farley front.
 
What I did with my Farley

was make a swivel for the front bag holder to sit on so that there is no way to bind the for-end no matter what angle the rifle moves in. It's the only one I've seen, to date. It's a cone and cup arrangement.

Pete
 
Pete Wass said:
was make a swivel for the front bag holder to sit on so that there is no way to bind the for-end no matter what angle the rifle moves in. It's the only one I've seen, to date. It's a cone and cup arrangement.

Pete
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OK....... this probably fringes on TMI but this is what I'm experimenting with. I'm working with a front bag setup on a Palmgren ball swivel assembly where the bag tracks the stock.

I'd like to see a pic of your cone and cup assembly. Does it lock? Or can you adjust the tension on the swivel?
 
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