What is it about cases and accuracy?

greg11 said:
Practically speaking, how many MOA will this process amount to?
Click to expand...

Like Jerry said, maybe a tenth. And like you said, get the big stuff solved and out of the way before you even start to worry about the small stuff like this.

The things mentioned here are very, very advanced high precision stuff. They are entirely appropriate for somebody looking to compete at national-level F Class competition or wanting to set a long range benchrest record.

*BUT*, to keep things in perspective and to help you judge what you do and don't want to do, it is probably useful to also know what level of shooting can be achieved *WITHOUT* this level of advanced precision loading techniques:

- honest rock solid 1/2 MOA at 100 yards (no brass prep, thrown powder charges)

- 10 shot groups averaging 0.7 to 0.8 MOA at 600 yards (no brass prep, thrown powder charges)

- 10 shot groups averaging 1.2 MOA at 1000 yards (no brass prep; sometimes this can be done with thrown powder charges, sometimes it might be necessary to weigh powder charges to the nearest tenth or so)
 
rnbra-shooter said:
Like Jerry said, maybe a tenth. And like you said, get the big stuff solved and out of the way before you even start to worry about the small stuff like this.

The things mentioned here are very, very advanced high precision stuff. They are entirely appropriate for somebody looking to compete at national-level F Class competition or wanting to set a long range benchrest record.

*BUT*, to keep things in perspective and to help you judge what you do and don't want to do, it is probably useful to also know what level of shooting can be achieved *WITHOUT* this level of advanced precision loading techniques:

- honest rock solid 1/2 MOA at 100 yards (no brass prep, thrown powder charges)

- 10 shot groups averaging 0.7 to 0.8 MOA at 600 yards (no brass prep, thrown powder charges)

- 10 shot groups averaging 1.2 MOA at 1000 yards (no brass prep; sometimes this can be done with thrown powder charges, sometimes it might be necessary to weigh powder charges to the nearest tenth or so)
Click to expand...

Thanks for putting this out there Daniel. Many people - including myself - sometimes get tied up in knots about stuff that actually makes little difference to the end result. I know from experience that some of the best groups I have put together have been from thrown charges as, on that particular day I simply shot better than usual. The results had naff all to do with the reloads but everything to do with me and limiting my (many) shooting faults.
 
Benchrest loading techniques by Charles Petty

Hi, I've found this very interesting articles on benchrest loading techniques from Charles Petty. He explains with a done and what he thinks is useful (and less useful).

The web article:
Benchrest loading techniques: Handloading Editor Petty offers a quick overview of advanced handloading tools and techniques

http://findarticles.com/p/articles/mi_m0BQY/is_4_48/ai_83483904/

The print article:
A very similar article in Hodgdon's 2010 Reloading Manual p. 52
Handloading: Why we do the thing we do
 
Crashman said:
Okay, so who makes the kind of tools needed to turn the necks? Are they power tools, or hand tools? And what board sponsor would sell them?
Click to expand...

I can offer lots of quality stuff for case prep. Just visit my website or send and email or PM.

Dropping 1 tenth minute on a 1.5 MOA hunting rifle is a huge waste of time.

Dropping a tenth to go from the high 2's to the 1's is HUGE from a precision shooting perspective.

All the gear and prep in the world will not save your skin if you cannot read conditions. I sure hope that never changes or I'll take up another sport.

There are many factory rifles that with proper prep and ammo CAN hold a 1/2 min way out there.

There are many mega dollar (and some not so expensive) F class rigs that will hold 1/4 min WAY out there.

The average shooter cannot tell a 2 to 3 MPH change in wind speed. Run that through a ballistic program and see how badly you just missed at 1000yds.

The difference between average and best gear is 1/4 min in general.

The difference between great and average wind reader is MANY times greater.

What do you think matters in the long run? AND where do you think we should all spend out efforts, time and money?

Jerry
 
agent_mango said:
Obtunded, do you ream the inside of the necks after the first firing? If so, is this only applicable when you have a chamber set up with 0.003" clearance for the neck, or can it help in a factory chamber?
Click to expand...

I almost never inside ream.

Here is what i do with typical new non fire-formed brass...

1) Chamfer case mouth.

2) Expand neck with expander mandrel... turn down to ~12 thou with neck turning tool

3) Load, shoot...

4) De-prime, neck size, clean, re-expand neck, anneal, reload and shoot.

repeat 4.....

Expanding the neck with a mandrel before each loading does two things... it gives me minimal neck tension, and any tendency towards doughnuts can be pushed to the outside where it can be re-turned as required.

I bump after every few firings, and I trim and turn if needed.

I anneal using a propane torch on a patio table in dusk light. Anneal until neck glows what I know is the right color, and patina roughly matches a new Lapua case. I don't quench in water. An exact science?? Hardly, but it DOES work like a hot damned. (no pun intended)

Neck clearance has little to do with accuracy really. As long as the bullet is centered in the bore, you can have as much neck clearance as you want. Generous clearance does help prevent pressure spikes. Sloppy chambers - I feel - are a different story.
 
You must log in or register to reply here.
Back
Top Bottom