Collecting Info and Planning
Dec 3, 2019 15:18:11 GMT -5
Post by ET on Dec 3, 2019 15:18:11 GMT -5
I’m really itching for more data about rise time (ignition intensity) and relationship of load resistance.
I believe the real eye-opener is going to be load resistance.
For a model PT to try and follow I decided to use an old 4759, 43gr and 250gr SST bullet. Here the Rise time was 90 with a peak pressure of 35K. This load developed 2300fps. And at this velocity it would cause fragmentation at close range. For this bullet I would like to see 2500fps and hopefully carry this velocity onto an all copper bullet.
As for the 225FTX and 200FTX I’d like to see a 2300fps for a youth or elder load. Also, I might ramp up the fps for a varmint load.
But first I still need to run tests on the different configured BP’s to see which one provides the best ignition property for a specific powder. Also incorporate load resistance effect on powder burn rate.
Some might think, what am I trying to prove? It’s not about proving but improving. To some the 50 SML might be a relic but It still has a lot to teach me. I never really enjoyed going to school but in this case look forward to the next classroom data session that seems a way off.
At one time I was only interested in finding 1- accurate and dependable load. I found it with 4759 and 250gr bullet. But now that load is gone with the discontinuation of 4759. Okay time to regroup on another quest. But this time I don’t want to keep all my eggs in one basket hence additional research for more options. Also, to be more informed about powder burn rates and factors that control their response. And this lesson has only just begun.
The one thing I can guaranty is my SML won’t be collecting dust, chuckle.
Ed
I believe the real eye-opener is going to be load resistance.
For a model PT to try and follow I decided to use an old 4759, 43gr and 250gr SST bullet. Here the Rise time was 90 with a peak pressure of 35K. This load developed 2300fps. And at this velocity it would cause fragmentation at close range. For this bullet I would like to see 2500fps and hopefully carry this velocity onto an all copper bullet.
As for the 225FTX and 200FTX I’d like to see a 2300fps for a youth or elder load. Also, I might ramp up the fps for a varmint load.
But first I still need to run tests on the different configured BP’s to see which one provides the best ignition property for a specific powder. Also incorporate load resistance effect on powder burn rate.
Some might think, what am I trying to prove? It’s not about proving but improving. To some the 50 SML might be a relic but It still has a lot to teach me. I never really enjoyed going to school but in this case look forward to the next classroom data session that seems a way off.
At one time I was only interested in finding 1- accurate and dependable load. I found it with 4759 and 250gr bullet. But now that load is gone with the discontinuation of 4759. Okay time to regroup on another quest. But this time I don’t want to keep all my eggs in one basket hence additional research for more options. Also, to be more informed about powder burn rates and factors that control their response. And this lesson has only just begun.
The one thing I can guaranty is my SML won’t be collecting dust, chuckle.
Ed