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by bruce moulds
Sun Mar 24, 2019 6:33 pm
Forum: Equipment & Technical
Topic: interesting barrel run in
Replies: 0
Views: 10

interesting barrel run in

i have a barrel that was run in and fired about 200 shots, but always fouled copper badly. being anal about running in, this was most annoying, so the barrel ended up in the cupboard for some years. a recent viewing with a borescope showed the leade/throat angle to be rough, almost like a file. as a...
by bruce moulds
Sat Mar 23, 2019 12:54 pm
Forum: Equipment & Technical
Topic: Is my scope Broke ?
Replies: 16
Views: 474

Re: Is my scope Broke ?

graham,
I sent one back to NF once in a similar mental state to you.
it came back with a report saying nothing was wrong and they had to do nothing.
but the priblem had gone away :roll: =D> .
bruce.
by bruce moulds
Thu Mar 21, 2019 7:24 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

that is why I said "per side." in case there might be confusion. 0.003" per side = 0.006 as per your definition. some factory chambers have been over max. one of note was a ruger 338 win mag where a fired case was, in front of the belt, almost equal in diameter to the belt! imagine ho...
by bruce moulds
Thu Mar 21, 2019 5:30 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

john, to a large degree blowback due to insufficient obturation can be connected to the amount of partial anneal applied to the neck, and also the upper body of the case. black powder cases need more partial anneal to obturate well, as pressures are lower. a good even partial anneal also achieves, a...
by bruce moulds
Sat Mar 16, 2019 12:32 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

wsftr, in all honesty, I have to ask whether I have ever been able to get ALL my bullets into 1/2 moa. the biggest factors seem to be powder charge and seating depth, or at least bullet relation to the lands, not sure which. and to some slight degree primers. to keep down at 1/2 moa the gun and ammo...
by bruce moulds
Sat Mar 16, 2019 10:42 am
Forum: Equipment & Technical
Topic: If ballistics is a science ....
Replies: 42
Views: 1683

Re: If ballistics is a science ....

lubing inside case necks. I have found that seating bullets into lubed case necks in an arbour press offers far greater consistency of feel than in unlubed ones. this suggests a more similar grip on the bullets. in my case I used graphite, and have never tried grease, but might. I wonder how any of ...
by bruce moulds
Fri Mar 15, 2019 7:41 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

pete, your last post makes good points. normal neck turning tool cutters DO go blunt quite quickly. standard tools might have to be adjusted several times in 50 cases, which already leaves room for doubt. carbide ones are better. a better turn is often achieved by doing at least 2 passes. 1st pass t...
by bruce moulds
Fri Mar 15, 2019 7:32 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

have you ever set a vernier or micrometer on 0.001 and looked at the gap? this much per side is very little. 0.002 is not much more, but seems to work. as we shoot a string, or more, how much crud can enter this clearance area of the chamber? there will come a clearance where inconsistencies in this...
by bruce moulds
Fri Mar 15, 2019 12:18 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

cleaning rod for a projectile.
what would be the fineness ratio of that projectile?
long range muzzle loaders used a rod guide that stuck up into the line of sight in order to avoid such issues.
bruce.
by bruce moulds
Fri Mar 15, 2019 7:26 am
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

john t,
your description of buffalo boys raises another question.
where do buffalo boys stand on the spectrum with grunter hunters?
bruce.
by bruce moulds
Fri Mar 15, 2019 6:53 am
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

getting back to artillery accuracy during the Vietnam war, the Vietnamese were shelling the kay sarn (spelling?) base from 30 miles away in laos. once they had the base dialled in, they started taking out individual targets like the ammo dump and the airstrip. this was so effective that sufficient s...
by bruce moulds
Fri Mar 15, 2019 5:55 am
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

well now we have that point cleared up, there only remains one question.
do they pick their noses, scratch their nuts, and dribble in public?
bruce.
by bruce moulds
Thu Mar 14, 2019 5:56 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

well 6mmbr said that 7mm has to have 0.004 clearance, so that has to be the best, period. clearance and neck tension are 2 different things. some br guys used to run zero tension, but they clean every group. this could be very dangerous in our situation. good annealing practice will help retain even...
by bruce moulds
Wed Mar 13, 2019 7:43 pm
Forum: Equipment & Technical
Topic: NECK CLERANCE - IS IT IMPORTANT?
Replies: 34
Views: 1518

Re: NECK CLERANCE - IS IT IMPORTANT?

2 questions.
who are the buffalo boys?
what is through the headstock and between centres chambering?
bruce.
by bruce moulds
Sun Mar 10, 2019 8:34 am
Forum: Equipment & Technical
Topic: If ballistics is a science ....
Replies: 42
Views: 1683

Re: If ballistics is a science ....

gyro,
you need to start from a foundation, or all else is wasted.
as an aside, congrats on doing a successful lapping.
my experiences doing this with bullet moulds have not always been happy ones in terms of roundness.
bruce.

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