brass prep what all counts

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rozziboy18

rozziboy18

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ok im taking a step back and re woring my situation as a shooter, im still a noob to the game and im trying to learn the best i can here.

ive ben loading for a 308lr dpms for about three months with 1-2 trips to the range per week and have loading close to 300 rounds in 5 shot groups and have tryed berger vlds, and more recently hornady sierra nosler, and get good groups at 100 yard. im shooting consistantly around .85-1.100 (on the good days) im use ing god components ie blc-2, varget powder, fed gmm,cci br primmers, laupua, nosler brass. so tell me how importan is bras prep i already trim deber,uniform primer pockets and swager them and deburr the flash holes but i still get the occational 3 or 4th shot will make a .75 group into a 2.00 group. what all am i missing?
 
You could sort the cases by weight. I don't know how much it might matter, but it won't hurt to be more consistent.

Are you weighing each and every charge? Are you crimping? Are you experimenting with the distance to the lands?

I can't name any specifically, but I know I have seen this type of question before. If you browse this forum, you will likely find other threads very similar to yours.

Your post is very hard to read, BTW.
 
rozziboy18,

You're doing all you need to do in regards to match prepping cases for 100 yard shooting. Your flyers are likely firearm or shooter related.

Don
 
h29zo102.jpg I get the occasional "flyer" that turns a 0.5 inch group into a 0.75 or bigger 3 shot group and I don't do any of the things you do except chamfer the case mouths.

Specifically I don't think:

1. cleaning primer pockets helps
2. weighing cases helps
3. turning necks helps unless you have a tight precision match chamber
4. deburring flash holes helps especially when using Nosler brass where the flash holes are already chamfered
5. swageing primer pockets helps unless you're shooting cases with crimped primer pockets which the ones you mention don't have

I would suggest trying CCI 250 (large rifle magnum primers) with Varget or IMR 4064 and 165 or 168 gr. match bullets. The new IMR 8208 XBR (I think that's the name) I think holds real promise but I haven't had a chance to try loads with it yet.
 
A tiny puff of wind or a slight mishandling of the rifle will do ten times more to ruin a group than not prepping primer pockets or flasholes etc.

Invest in a good action, a great barrel, and quality bullets. That is the most bang for your buck as far as shooting good groups. An accuracy smith putting it together won't hurt either.
 
http://findarticles.com/p/articles/mi_m0BQY/is_4_48/ai_83483904/ Not bad shooting for an auto. Weigh your brass, sort by .1gr and get a set of Redding Full Length sizing Type-S Bushing dies. These 2 will help you the most. IMO 1 more thing, the higher power the scope, the tighter the groups, but a fixed power like 36X can be almost useless in poor conditions, unless your an expert BR shooter.
 
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thanks for all the help guys chances are it was shooter related after all im not bob le swager im brandon the mechanic from tennesse that is workin up a load, ill recheck my qc and load down on my shots and try a post some groups later tonight if i can
 
How much time between rounds? How often do you clean & how do you clean the barrel. Make sure all the screws are at the proper torque spec. Work on your breathing, get a trigger job, wear out a set of snap caps.
 
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