Search found 120 matches

by John T
Thu Oct 04, 2018 4:01 pm
Forum: Equipment & Technical
Topic: HOW FULL IS A FULL CASE?
Replies: 12
Views: 952

Re: HOW FULL IS A FULL CASE?

David, sorry about being obtuse, my comments about the soft seated flat base bullets related to the Wolfpup, not to your load. I take it that compressing slow burners when seating the bullet is par for the course, so I will develop my load in the usual way and not be concerned where the base is in r...
by John T
Wed Oct 03, 2018 6:31 pm
Forum: Equipment & Technical
Topic: HOW FULL IS A FULL CASE?
Replies: 12
Views: 952

Re: HOW FULL IS A FULL CASE?

Hello David. It may be ok to soft-seat light, short, flat based 30 cal. bullets in that case, but would it work with BT Bergers? I am very interested that slow powders like a little compression. I have not used anything other than 2209 in my 7 RSAUM and my use of 2213 in my 284WIN did not involve co...
by John T
Tue Oct 02, 2018 5:40 pm
Forum: Equipment & Technical
Topic: HOW FULL IS A FULL CASE?
Replies: 12
Views: 952

Re: HOW FULL IS A FULL CASE?

Williada, the 7 RSAUM barrel is on the shelf while I play with my 6.5 WSSM wildcat at short ranges. Before I changed barrels, I fired some test loads of 183 SMK's with 60.5, 61.0, 61.5, 62.0 and 62.5 of RL-23, with little or no pressure signs. But the recoil was significantly heavier than the load o...
by John T
Thu Sep 27, 2018 5:24 pm
Forum: Equipment & Technical
Topic: HOW FULL IS A FULL CASE?
Replies: 12
Views: 952

HOW FULL IS A FULL CASE?

Hello All. For many decades, it has been axiomatic that to achieve maximum efficiency from a case, it should be loaded so that:- 1. the powder charge fills the powder chamber, that is, up to the body/shoulder junction; 2.the base of the projectile does not intrude into the powder column, that is, th...
by John T
Wed Sep 12, 2018 5:35 pm
Forum: Equipment & Technical
Topic: 183SMK LOAD IN 7RSAUM
Replies: 6
Views: 635

183SMK LOAD IN 7RSAUM

Hello SAUM Shooters. My BAT is now fitted with a 1:8 for the longer 183SMK and for the 184BER when they arrive. So far, I have shot about 100 183's in old cases loaded with 2209. 54.0 seems to be OK. I know that 2213 is regarded as dirty, but if it performs, who cares? Any info on loads for 2213 and...
by John T
Tue Aug 14, 2018 9:03 pm
Forum: Equipment & Technical
Topic: 7mm SAUM Rechamber/Barrel Life
Replies: 83
Views: 4861

Re: 7mm SAUM Rechamber/Barrel Life

Hello Marty. 2000 out of a 284WIN is a very good return. So is 1200 out of a 7RSAUM (54.5 of 2209?). But then, you've never been a "hot head". Unlike out two friends in the Field Artillery, Rod and Dave; 57.0 indeed !? No wonder your best is 800, Dave. My limited experience has pre-taper-o...
by John T
Thu Jun 07, 2018 12:10 am
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 5573

Re: Barrel Behaviour Theory

Calling all trombone players.

Are trombone wave forms comparable to what happens in a rifle? Think of the slide as the bullet.

In "position", the slide produces an harmonic, a note, out of "position" it produces a clanger.

Regards,
John Tracey.
6.6.18
by John T
Tue Jun 05, 2018 4:09 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 5573

Re: Barrel Behaviour Theory

Williada, I have mistakenly assumed that the barrel is an open-end medium, without taking into account the BULLET. Does this mean that the medium has a closed and stationary end and a closed but moving end? If so, does this mean that new standing waves are being generated constantly as the bearing s...
by John T
Mon Jun 04, 2018 10:09 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 5573

Re: Barrel Behaviour Theory

Hello Peter.

At the risk of being charged with hypocrisy, I have to say that you need to move on, rapidly, to RIFLE Behaviour Theory, or risk losing your audience.

Why do you persist with standing wave theory when there is no standing wave in a free-end medium?

Regards,
John Tracey.
4.6.18
by John T
Sun Jun 03, 2018 10:20 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 5573

Re: Barrel Behaviour Theory

Hello Peter. Your topic has caught the attention of two of the icons of our discipline, Alan Fraser and Rod Davies; along with those of us who want some empirical knowledge of the building blocks of rifle tuning. Those who advocate, make, sell and use barrel tuners will be near breathless awaiting y...
by John T
Fri Jun 01, 2018 5:16 pm
Forum: Equipment & Technical
Topic: Barrel Behaviour Theory
Replies: 79
Views: 5573

Re: Barrel Behaviour Theory

Hello Peter. To what extent, if any, do the principles of standing wave patterns and harmonics apply to a free-end medium, such as a fitted rifle barrel? Does fluting lessen density, in the context of barrel wave patterns? If so, are there two boundaries and three separately located wave patterns in...
by John T
Sun May 20, 2018 9:32 pm
Forum: General Forum
Topic: MCSI, update needed
Replies: 11
Views: 1006

Re: MCSI, update needed

Danny.

Can you breakdown the scores to give the results at 500 and 900, separately? Previous results would be interesting.

Regards,
John T.
by John T
Sun May 20, 2018 6:11 pm
Forum: General Forum
Topic: MCSI, update needed
Replies: 11
Views: 1006

Re: MCSI, update needed

Hello Danny.

At what distances are these teams events conducted? Is there a pattern, for example, are the scratch scores at short ranges fairly close, but the difference is larger with the MCSI adjusted scores? Does this imbalance lessen as the ranges get longer?

Regards,
John T.
by John T
Mon May 14, 2018 8:16 pm
Forum: Equipment & Technical
Topic: tell me about tuners for fclass
Replies: 94
Views: 6171

Re: tell me about tuners for fclass

Barry, Matt et el.

What about a "ploughman's tuner"?

30" x 1.25" barrel.
Counter-bored to 1.2" x 0.85"
OD threaded
2 of, 1.25" x 0.4" x 2.0" ring weights.

Forward movement is the prime requirement.

Regards,
John Tracey.
14.5.18
by John T
Mon May 14, 2018 7:08 pm
Forum: Equipment & Technical
Topic: KEEP ME IN TUNE
Replies: 10
Views: 1288

Re: KEEP ME IN TUNE

Hello all. Assume that you have developed a "load" ( best-tested combination of brass, sizing, neck tension, primer, powder and load, seating etc.) for your bullet-of-choice that is "in tune" with your rifle to the extent that you have confidence in maintaining X-Ring (.5moa) ele...

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