Building 40cal looking for info

If a Pitman 275 or a fury 275 will take elk down -then they should work better on deer. Both will shoot well in your.40 but the pitman will be best. Recoil will be mild if you have a good brake.
Powders that have worked I'll list best to worst with the best burning the cleanest. For testing you should brush between shots to see what shoots the best. After that test to see what will go down the barrel without brushing.

Varget RL15 IMR4166 H4895 RL15.5 RL16 H4350

I'm not sure what your chamber specs will be so find out before you shoot the 1st shot.
I would recommend 60 grains of any of the above powders for a start. Going up 5 grains will increase speeds approx 100-120 fps with all of the above - but your results might differ.
I have listed RL16 as a dirtier powder in my.40 -for others it's the cleanest. If you have any of the above powders already -try them to see what happens. The.40 cal can be picky on what it likes. I found all the above powders worked well if I brushed between shots and only 2 that hardly need the bore to be cleaned.

As previously stated - Contact Sew for more info.

I have 3 40s: 2 26” barrels, 1 with 209 ignition, other DI and a 24” barrel/DI. All of the loads calculate below 50K PSI, though most are near. I do have other loads for heavier bullets. Pressure is your friend: cleaner burns, lower ESs, less temp sensitive. The loads I shoot w/o reservation in my ultralite 40 cal. Though I keep my higher pressure loads (calculated 50-70K PSI) to myself, generally for my robust 26” 40 and 253, 273, 278 and 300/303 g bullets, the loads below are highly adequate for 300-400 yards. You can only kill a deer so dead and preferably where you can’t see through it.

The VV powders are clean burning as is 2015. H4198 is excellent but make sure of your chamber size (mine are 60gs). A wool wad can take up some of the space. 

I’ll run some Varget. In my 209 (2001 PN 40) , I used a duplex of VV110/Vgt with smooth sized AM225/228s with excellent accuracy. Pressure - ? Likely, too hot 7/70 got 2950 and maybe too hot 6/65 and got 2825. But, this was with a 209 primer and a very long, RB BP. With His and especially DI, these loads would be hotter yet. With DI, the usage of VV110 would be negated, likely. Vgt alone, with the 209 ignition had too much ES and was fairly dirty. The duplex of VV110 corrected that. 

Note: the 253g bullets are Pittman Hammers, full sized. They are available from Hammer bullets (252g). 

I would encourage you to reconsider the 60 gr powder chamber as it would eliminate the use of H4198 powder, my favorite so far with the 228 gr Pittman bullets. I have a few of the same #6 Brux barrels that all shoot that bullet ~ 2800 fps with very good accuracy and light recoil with no brake. Mine all have minimum powder chambers and I would suggest no more than a 50 gr chamber if you want to shoot lighter bullets with either 4198 or VV120. Maybe sew will comment more on chamber size...



































#Brux barrels

Ok, 50g chamber it is. Thank you.