Rim thickness gauge
- Thread starter MrSharp
- Start date
I have read a bit regarding rim gauging rimfire cartridges and it testing has shown it is not worth it. Weighing the cartridges,on the other hand, and sorting them by weight seems to tighten groups with match and bulk alike. W have weighed bulk pack Thunderbolts and have good success decreasing the group sizes at both 25 and 50 yards (along with increasing the fouling on my crown, in my bore, chamber and action considerably after thirty rounds). So weighing does work.
When you weigh them there are 5 different factors that can vary the weight...casing, primer, powder, bullet, lube. No way to know which one or group of them is causing the difference in weight. Studies have shown that the primer consistancy and type of lube used effect accuracy the most.
Possibly, but there is nothing one can do to alter any of those factors so weighing is about the only method to help reduce group size.
I have not had any positive input from Rimfire Benchrest shooters as far as measuring rim thickness/weighing.
The general consensus is that time is better spent in practice.
High quality ammo is always involved here, however.
With run-of-the-mill ammo, there may well be some advantage to weighing and sorting by weight.
Never saw a truly serious BR shooter that used that sort of ammo anyway.
Regards, Eagleye.
The general consensus is that time is better spent in practice.
High quality ammo is always involved here, however.
With run-of-the-mill ammo, there may well be some advantage to weighing and sorting by weight.
Never saw a truly serious BR shooter that used that sort of ammo anyway.
Regards, Eagleye.
Measuring rim thickness may make no difference but for the guy who wants to sort his ammo its a great tool. Just one more thing to tinker with, which is part of the fun for some.
As for me I am in Eagleye's camp all the way. Buy a lot of good ammo and shoot it.
As for me I am in Eagleye's camp all the way. Buy a lot of good ammo and shoot it.
Not necessarily. If the primer or powder is slightly less then you will have a low flier, if the bullet itself weighs less it would normally be a high flier. I sort my ammo on occaision but only to cull out about 5% of the worst rounds (either over or under mean average weight). These get used as foulers or get shot uprange in rapid fire. Rim thickness seems to be a bigger factor on my bolt actions.
