Over pressure?

[DRC458]

Yeah, you're pushing the envelope with 43.0. Hodgdon lists 42.0 as max, with pressure of 50,500 CUP (max is 52K).
Barnes shows a max of 40.5 grains with their 95 grain XFB.
And, the brass ... you're comparing apples and oranges and grapes and grapefruit.

 

[magna19]

Yeah, you're pushing the envelope with 43.0. Hodgdon lists 42.0 as max, with pressure of 50,500 CUP (max is 52K).
Barnes shows a max of 40.5 grains with their 95 grain XFB.
And, the brass ... you're comparing apples and oranges and grapes and grapefruit.

This for sure!!!!! Definitely excessive pressure for that firearm. Back off 1.5 grains if your going to mix brass with H4350 at max.

 

[dennishoddy]

You'd be amazed at the difference between max loads in reloading books from 40 years ago vs current manuals if the same manufacturer, using the same powder and bullet.

I started collecting load data from the early 80’s before the legal system got involved. Your exactly correct. Max loads are much milder now in today’s load data.

 

[magna19]

And here is some of the older data. Bob Hagel 1978

 

[DRC458]

My oldest reloading manual is early 70's vintage. Yeah ... lot of difference. I will keep it and refer to it now and then, sometimes just for giggles. Component manufacturers must cringe knowing that stuff is still out there and people still using it. Actually, I have one copyrighted 1970 that I bought in recent years off of ebay because it contained data for a wildcat that it's almost impossible to find any data for.

 

[kwaynem]

So what has changed to where they say don’t use that data anymore?

 

[magna19]

Ive read that some of the older writers measured the expansion ring to determine maximum pressure. Also some of these firearms were re-barreled during load development from bulged chambers to soft barrels etc.. I suspect a lot of brass never went more than 2 firings also. I use the Bob Hagel data for comparison to the more modern data available today. If I see any modern data close to his I pay more attention to near max data. I pay very close attention to brass case capacity, powder lot, primer, temperature, freebore, and usually keep barrel clean every 5-10 rounds when working with any loads near his max listed. The only way to see if you have cartridge that will produce his claimed velocities is to try and approach them. I do have a 7 rem mag that gets all his claimed velocity with a 150 Nosler Ballistic Tip and a Berger 168 Classic Hunter that he would be proud of.

 

[DRC458]

So what has changed to where they say don’t use that data anymore?

I believe there are a number of reasons, not the least of which is the risk of liability lawsuits nowadays. Technology has changed drastically since the 'old days' and they have much more accurate means of measuring cartridge pressures and performance. I think they know, and understand, a lot more of what is going on inside that cartridge case. I think SAAMI has also revised the pressure limits in some instances. There may have also been some changes in the composition of various powders. A number of changes may have led to technological 'advances,' but may have also changed the way of thinking when it comes to "maximum allowable" or advisable. Maybe they are also trying to "idiot proof" the process.

 

[Snattlerake]

As long as there are men with reloading equipment...

 

[Shriner]

If anyone follows the write-ups on powders, they have changed over the years as powders moved from one plant/manufacturer to another and as the chemical recipe changes. Plus testing changes was it fired from a rifle or a uni-recv , what type of senors took the readings.