6 degree lead

R

Rflshootr

Member
I was just looking at a 6BR reamer on Grizzly Industrial. According to the drawing they have, the reamer has a 3* per side throat angle. Can anyone tell me why? I was under the assumption that 1.5* per side was standard and proven on bench rest cartridges. :confused: The 6 Dasher and 6PPC reamers are 1.5*. What's up with that? Is there a specific reason that I'm not aware of?
 
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Rflshootr said:
I was just looking at a 6BR reamer on Grizzly Industrial. According to the drawing they have, the reamer has a 3* per side throat angle. Can anyone tell me why? I was under the assumption that 1.5* per side was standard and proven on bench rest cartridges. :confused: The 6 Dasher and 6PPC reamers are 1.5*. What's up with that? Is there a specific reason that I'm not aware of?
Click to expand...

I believe that the 6 degree [included] angle is the original Remington/SAAMI spec.
This according to a JGS , "Popular American Sporting Calibers" reamer print booklet, dated 1993.RG
 
Throat angle

Some people will use a throat angle that closely matches the ogive of the bullet. This can at times be a steeper angle than 1.5 degrees. For instance a 7 ogive 6mm bullet would more closely match a 1.85 degree throat angle. Angles between 1.5 degrees and 2 degrees seem to be the most popular. The throat angle seems to decrease with throat wear. Some people may start closer to 2 degrees to help compensate for throat wear.

Michael
 
Rflshootr said:
I was just looking at a 6BR reamer on Grizzly Industrial. According to the drawing they have, the reamer has a 3* per side throat angle. Can anyone tell me why? I was under the assumption that 1.5* per side was standard and proven on bench rest cartridges. :confused: The 6 Dasher and 6PPC reamers are 1.5*. What's up with that? Is there a specific reason that I'm not aware of?
Click to expand...

I actually prefer this steeper leade angle. It shoots with the same accuracy as a 1.5 degree but is steep enough that bullets will not get stuck when hard jamming thereby preventing powder dumps in the chamber during non-firing extactions, also in-land seating depths are much more precise since jam depth generally only occurs at a single depth measurement before the bullet starts moving back in the case, leade erosion is alot less since there is more material with the steeper angle.............Don in Redondo
 
mturner said:
Some people will use a throat angle that closely matches the ogive of the bullet. This can at times be a steeper angle than 1.5 degrees. For instance a 7 ogive 6mm bullet would more closely match a 1.85 degree throat angle. Angles between 1.5 degrees and 2 degrees seem to be the most popular. The throat angle seems to decrease with throat wear. Some people may start closer to 2 degrees to help compensate for throat wear.

Michael
Click to expand...

Michael Turner???? THE Michael Turner???

Where ya been Man? (rhetorical question...) Good To Hear From You :)

al
 
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