A cautionary tale??

[downwindtracker2]

Were those 180 grain bullets that you used maybe jammed into the lands on that BSA P-17?? If bullet is jammed on chambering, I believe that is like adding several grains of powder - results in higher pressures. Somewhere in pieces here is a BSA conversion - I know I used one BSA P-17 receiver to make up a "wanna be" Rem 30, and I have used a BSA P-14 action on a sporter, but I am not certain if they used the original WWI barrels, or if they always made and installed new barrels for their conversions.

No, I used the two stick method. Dowels really. One stick pushing, the barrel one getting knife marks. A caliper to measure. Calipers are considered +/- .005" by machinists.

I like the P-12/13 series of rifles. I have a C Broad Arrow P-17 sporter in 308 Norma, it has the original barrel,but as a 30-06 had headspace issues. A BSA P-17 sporter rebarreled 358Norma long neck, a P-14 Winchester sporter. At a gunshow "Some sort of Mauser in 303." That's a fun rifle, it has a Parker Hale iron sights and Boyds 2nd stock reshaped English stalking pattern. Or least my idea of it. Plus the Canoe Rifle. BTW P-17 is the correct Canadian designation . The great C.D. Howe used it in correspondence.

 

[Andy]

Yet we trust factory ammo which is "someone else's load" and millions of people use them in an enormous variety of firearms. What factories do is load in such a way that it "should work" in any rifle it is likely to encounter. For example they will typically load 30-06 to well less than the SAAMI 3.340" for all bullets and shorter yet for round nose bullets.

An easy safeguard for any ammo including factory is to see if a round will chamber and extract without any issues such as jamming the bullet into the lands.

 

[Potashminer]

Andy - I think we also "trust" factory ammo because it likely gets pressure tested on real pressure testing machines to ensure that the pressure it develops is at or less than SAAMI call out. Not so sure about all the stuff from Third World places, though. I do not know any home hand loaders who have access to that gear - I certainly do not.

 

[dan belisle]

Andy - I think we also "trust" factory ammo because it likely gets pressure tested on real pressure testing machines to ensure that the pressure it develops is at or less than SAAMI call out. Not so sure about all the stuff from Third World places, though. I do not know any home hand loaders who have access to that gear - I certainly do not.

Used to be able to buy pressure sensors you could attach to your chamber, and could pressure test that way. - dan

 

[Potashminer]

I think those might be the "Trace" system - a piezometer is glued or epoxied to the chamber - produces a value based on the pressure pulse - does not produce a pressure reading - has to be compared to something else - like a known pressure calibration load that is only available to very few. I believe the gunmaker Charlie Sisk in USA uses or used to use one for developing some of his ideas.

I do not own one, nor do I know anyone who uses one.

 

[dan belisle]

I think those might be the "Trace" system - a piezometer is glued or epoxied to the chamber - produces a value based on the pressure pulse - does not produce a pressure reading - has to be compared to something else - like a known pressure calibration load that is only available to very few. I believe the gunmaker Charlie Sisk in USA uses or used to use one for developing some of his ideas.

I do not own one, nor do I know anyone who uses one.

Produces a voltage which can be compared to their pressure chart. - dan