Search found 555 matches

by pjifl
Sun Jun 28, 2020 12:18 pm
Forum: Equipment & Technical
Topic: Ogive to base measurement.
Replies: 11
Views: 802

Re: Ogive to base measurement.

I have no information on tolerances and whether it is worth going to the extra trouble and measuring bearing surface. Could be - maybe ? Most comparators measuring base-ogive use a dial gauge directly on the base. If a small 'tube' was made to fit on the dial gauge stem or thread into the dial gauge...
by pjifl
Sat Jun 27, 2020 8:33 pm
Forum: Equipment & Technical
Topic: Sweet's Oil
Replies: 37
Views: 1888

Re: Sweet's Oil

There was a brew that many old timers made up using Neatsfoot Oil and a small amount of Phenol. Of course they had Neatsfoot Oil on hand for application to Boots, and a diluted Phenol Compound in the form of 'Phenyle' used as a sanitizer around very old Hospitals - even back to Lister - and more rec...
by pjifl
Wed Jun 24, 2020 6:04 pm
Forum: General Forum
Topic: Robert Chombart
Replies: 6
Views: 507

Re: Robert Chombart

I had various eMail conversations with Robert. He would be known here for designing some actions. Also known to TR and Match shooters who have shot in Bisley. I believe Robert led many astray with his potent brew. But he also had an interesting and varied life. As a young lad he was a spectator to t...
by pjifl
Mon Jun 15, 2020 5:49 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Interesting on the rubber flex system. I always had some doubt but must admit I never used one. When I went from wood > wood + pillar > (both with a compound > to Al V block I think it was a progression in the right direction. I think all can work well but the system has to be practical and robust. ...
by pjifl
Mon Jun 15, 2020 2:06 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Has Otteson produced an updated book on recent target actions or is it simply a recompilation of his older Book 1 and Book 2 ? For anyone interested, I can confirm that these older books are outstanding for what they are. He often goes into detail forgotten by many today. These old books are highly ...
by pjifl
Mon Jun 15, 2020 9:41 am
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Has anyone any experience with V blocks compliantly rubber coupled to the main block in a stock or something similar. This was a trend at one time but it seems to me that there are other systems that shoot just as well ? Some were in effect a linear rubber controlled mini recuperator. I remember the...
by pjifl
Sat Jun 13, 2020 1:06 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Limitations placed on equipment by overzealous weight restrictions have resulted in a search for extremely light stocks. To retain what was once 'normal' stock rigidity in these very light stocks now necessitates carbon fibre shells and strips. Some call it progress but I am not so sure. Maybe on a ...
by pjifl
Fri Jun 12, 2020 7:10 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Yes - we could all be wrong. In fact it is highly likely. Also, a lot of stuff gets reinvented. My main reason for writing was to get across to people the amount of recoil movement before bullet exit - especially the rotational movement - which is very rarely covered. Both Linear and Rotationally, i...
by pjifl
Fri Jun 12, 2020 6:06 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Maybe it's like this : a stiff stock will tolerate more handling variations in terms of it staying in a more inert state than a flexible stock i.e. the flexible one more easily gets loaded with stored energy. No problems there, until u release the shot. The more inert platform/stock will behave...
by pjifl
Fri Jun 12, 2020 5:43 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Peter just your words about the impact on where u put your hand on the pistol grip tells the whole story about stock stiffness. A flexible stock is highly sensitive to handling changes/errors. I do not see that at all. In fact it may be the reverse. The lower hand grip forces the stock to kick side...
by pjifl
Fri Jun 12, 2020 5:32 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

My previous recoil calculations take into account the mass of powder. Some approximations but should be fairly close. About 1/4 of the recoil is due to the mass and velocity of powder. But at the moment the bullet exits, almost all of the powder is still in the barrel. The rifle setup has almost no ...
by pjifl
Fri Jun 12, 2020 5:05 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

Widely held beliefs are often wrong. Crowd mentality is the norm these days. The last two time I competed in the NQRA Queens in Townsville I had more Xs than anyone else. Both times with what most would consider a quite flexible stock, especially in the forend. Fairly strong at the throat just behin...
by pjifl
Fri Jun 12, 2020 3:38 pm
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

When I mentioned that I had different zeros from each shoulder, I was referring to TR sling shooting a much lighter rifle (an old SMLE way back) than an FO rig. The butt is then of course pulled tightly into the shoulder. I used to think that certain woods shot better than others and were superior b...
by pjifl
Thu Jun 11, 2020 9:19 am
Forum: General Forum
Topic: Tuned barrel
Replies: 52
Views: 2652

Re: Tuned barrel

I always found that shooting from my right shoulder had a slightly different zero than from my left shoulder. More so for a high recoiling rifle. Not very surprising, really. But it does indicate that hold on a stock will have some influence.

Peter Smith.
by pjifl
Wed Jun 10, 2020 6:15 pm
Forum: Equipment & Technical
Topic: 2 from LEFT FIELD
Replies: 9
Views: 855

Re: 2 from LEFT FIELD

I know that experiments have been done to use a small tube leading from primer hole to a position well up the powder column. The objective was to achieve better or more uniform ignition. Cigarette paper has been used as the tube. Some artillery does use something like a perforated stalk leading from...

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