257 Roberts AI Finally!

TG1911 said:
Starting with RL17 and 115-gr Ballistic Tip. I have many choices of bullets, so it should be a fun summer at the range. The local range should open in 6 weeks or so. When the snow melts. Currently I drive 2 hous each way to a range.
Click to expand...
Nice!
I am going to try Re-17 and the 115 gr BT in my 257 Roberts.
QuickLoad is suggesting that I should get up to 3085 fps out of my new-to-me custom LH Sako M591 with a Shilen 22" barrel, w/ a max load at 45.2 gr of Re-17.
A max load of 45.1 gr of H-414 should get up to 3041 fps.
Luckily, I have a decent supply of each powder, primers, and bullets in stock.
Will have to see how these perform!
 
TG1911 said:
Starting with RL17 and 115-gr Ballistic Tip. I have many choices of bullets, so it should be a fun summer at the range. The local range should open in 6 weeks or so. When the snow melts. Currently I drive 2 hous each way to a range.
Click to expand...
Blkram said:
Nice!
I am going to try Re-17 and the 115 gr BT in my 257 Roberts.
QuickLoad is suggesting that I should get up to 3085 fps out of my new-to-me custom LH Sako M591 with a Shilen 22" barrel, w/ a max load at 45.2 gr of Re-17.
A max load of 45.1 gr of H-414 should get up to 3041 fps.
Luckily, I have a decent supply of each powder, primers, and bullets in stock.
Will have to see how these perform!
Click to expand...
Be cautious with RL-17 when the temperature rises so does the pressure. I used it back in 2017 or 2016 in my GAP 260 for competitions and sadly was unable to keep it at the expected velocity when I developed it.

I had always used 42.5 H4350 behind a 139 Scenar. Why I thought the extra speed was a better idea is beyond me. I can probably say the same thing with the Norma URP I have too, very similar to RL-17 in burn rate.
 
I’m going to do more of a speed demon, 25/7PRC , but I had been planning on something a little milder, 25/284? Borden Timberline Mag action with a Watts extended box in a Hawken M5 BDL, that allows you to swap it out for a M5 DBM. It’s going into another MCS T Elite Tach Carbon stock so it should be a good bit lighter than what I normally use. It’ll be a 9-10 lb. hunting gun if my math is correct.

image.jpg
 
longrangehunter said:
Be cautious with RL-17 when the temperature rises so does the pressure. I used it back in 2017 or 2016 in my GAP 260 for competitions and sadly was unable to keep it at the expected velocity when I developed it.

I had always used 42.5 H4350 behind a 139 Scenar. Why I thought the extra speed was a better idea is beyond me. I can probably say the same thing with the Norma URP I have too, very similar to RL-17 in burn rate.
Click to expand...
I'll keep that in mind for antelope hunting, as it can be in the high 20's (approx 80 F) in Sept in Alberta.
For deer season here in November it is usually well below zero (32 F) so shouldn't be a problem.

While velocity is great, I load for accuracy, which usually nets less velocity. (of course, I am happy when I get both! 😁 )
 
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