Search found 462 matches

by pjifl
Wed Oct 23, 2019 8:39 pm
Forum: Equipment & Technical
Topic: Twist rate to charge weight
Replies: 14
Views: 674

Re: Twist rate to charge weight

Yes. I am more interested in MV out of curiosity. I could work out the linear and rotational Kinetic Energy changes but doubt that it will prove much.

Peter Smith.
by pjifl
Wed Oct 23, 2019 9:44 am
Forum: Equipment & Technical
Topic: Optimum 308 Win neck engagement
Replies: 13
Views: 604

Re: Optimum 308 Win neck engagement

I think the 1 calibre 'industry standard' as a minimum is more related to military ammo which may have a rough life. Reloaded stuff, individually and lovingly packed, is a different situation. Military Ammo used in a machine gun has to stay together after severe slamming. When attempts were made to ...
by pjifl
Wed Oct 23, 2019 9:27 am
Forum: Equipment & Technical
Topic: Twist rate to charge weight
Replies: 14
Views: 674

Re: Twist rate to charge weight

It would be interesting to get very accurate muzzle V measurements. On one hand, more energy is carried by a faster spinning bullet with the same MV, but on the other hand there is likely to be an increase in pressure perhaps also leading to higher MV. Everything else needs to be absolutely identica...
by pjifl
Sun Oct 13, 2019 12:30 pm
Forum: General Forum
Topic: Minimum Speed Needed for 1000Yds
Replies: 6
Views: 628

Re: Minimum Speed Needed for 1000Yds

While this does not answer your question, it may be very pertinent. 'comfortably exceeding the speed of sound' is hard to pin down. Some bullets designs are less compromised than others and not always is the highest BC bullet necessarily the best choice. Of course you may have little choice. As a ba...
by pjifl
Fri Oct 11, 2019 9:14 am
Forum: Equipment & Technical
Topic: Oversized windage dial
Replies: 42
Views: 1678

Re: Oversized windage dial

I have a file up at https://sites.google.com/site/pjoptical/wind-knob of a strip for a NF BR 6 minute knob. It is a high quality Bitmap. These are photo files of some of the strips used for the F Open Large Coaching Knobs. You can make your own scales. Eventually we standardized on an outer diameter...
by pjifl
Wed Oct 09, 2019 4:15 pm
Forum: Equipment & Technical
Topic: Oversized windage dial
Replies: 42
Views: 1678

Re: Oversized windage dial

Knowing what windage is set on the scope is always worthwhile and in a 2 target team shoot how else can one coordinate the two coaches and use each other's expertise. The large coaching knob was designed with this in mind. It also allows one to estimate Aerodynamic Jump. Nightforce BR scopes have th...
by pjifl
Fri Oct 04, 2019 3:47 am
Forum: Equipment & Technical
Topic: Best bore scope
Replies: 42
Views: 2110

Re: Best bore scope

There are other very high quality 'borescopes'. Not that I am knocking the Hawkeye. Do some eBay searches bases on 'Rigid Endoscopes'. There are other names. Many from China and are of very good quality. These are all aimed at the medical field. Most are actually autoclaveable. I have never looked a...
by pjifl
Thu Sep 19, 2019 1:10 pm
Forum: Equipment & Technical
Topic: Q: Type S full dies vs body dies ?
Replies: 10
Views: 1006

Re: Q: Type S full dies vs body dies ?

It is also possible to cut off the die top a long way down and push the case entirely through the die if you want to work on the entire base. You need a small stub as a 'pusher' piece on the shell holder and may need to readjust the position of the die during the process and have a second or third g...
by pjifl
Tue Sep 17, 2019 1:41 pm
Forum: Equipment & Technical
Topic: Auto Trickler upgrade, prepare to kick yourself if you’ve just bought one
Replies: 30
Views: 3749

Re: Auto Trickler upgrade, prepare to kick yourself if you’ve just bought one

I have used a lot of O rings and always had some on hand or left over so used them in my own projects with varied success. Some types of O rings last well, others are a disaster. Under any tension most develop micro cracks early and then break. Depends on the material and how long they have been on ...
by pjifl
Mon Sep 09, 2019 12:51 am
Forum: Equipment & Technical
Topic: scope objective lenses
Replies: 3
Views: 547

Re: scope objective lenses

If you can improve the definition by stopping down the objective lens, this tells you that the design is less sophisticated. But don't blame the scope maker - read on. Best position is for the stop to be close to the lens with high magnification small field of view optical instruments like a riflesc...
by pjifl
Thu Sep 05, 2019 7:07 am
Forum: Equipment & Technical
Topic: Barrel Change
Replies: 17
Views: 1564

Re: Barrel Change

The worst situation for seizing is a stainless barrel in a stainless action. Far less of a problem with stainless against hardened black steel. I hate loctite or some other 'glue' on barrel threads. It is almost impossible to clean all of the compound out of the action threads and is unnecessary. It...
by pjifl
Tue Sep 03, 2019 4:06 pm
Forum: Equipment & Technical
Topic: Torque wrench/ driver
Replies: 10
Views: 1142

Re: Torque wrench/ driver

If the Al block is made so the centre is undercut slightly by a few thou leaving the forward and rear to bear an equal distance in front of and behind each screw, I believe the Al Block never distorts. Surely if the action is drawn down into the Al, that is not a bad thing as long as the previous ba...
by pjifl
Tue Sep 03, 2019 11:31 am
Forum: Equipment & Technical
Topic: Torque wrench/ driver
Replies: 10
Views: 1142

Re: Torque wrench/ driver

My reply was gobbled up somehow so here goes again. I did buy a special torque wrench but hardly ever use it now. I doubt that good quality Socket Head Cap Screws holding full depth in a hardened Barnard can be over tightened by hand enough to do damage unless you really try. This maybe different in...
by pjifl
Wed Aug 07, 2019 6:07 pm
Forum: Equipment & Technical
Topic: Mound Setup 101
Replies: 35
Views: 3874

Re: Mound Setup 101

Mound setup is very important. There are basics, but, often the first time you shoot on a strange mound, you are presented with a new situation. Analyse the the situation and setup and be prepared to change and move and choose a different position on the mound. If there is a good reason to break the...
by pjifl
Sat Jul 27, 2019 6:10 pm
Forum: Equipment & Technical
Topic: tell me about current 7mm bullets.
Replies: 30
Views: 3426

Re: tell me about current 7mm bullets.

Focusing the Graticule for the eye is via the eyepiece and is done first. And ideally this is best done with no target image in the scope - just a bright background. Unfortunately it changes with your state of health and hydration and if you have been reading a lot before the shoot. If for some reas...

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