Hello 2a Members!
Cat here, doing my thing. So, as a new reloader, I have found that using the Lee Handloader kit is extremely fun...and extremely slow. Especially for a complicated round such as 303 Brit (many have commented and commended me on taking on such a task). Anyways, Today I finally Got a chance to get some data in for the rifle. And well...Its kind of weird. To sum up what I did, heres a small break down of what i had:
20 rounds prvi partisan 180 grn, soft point
(handholds had the same input: winchester/PPU casings, winchester magnum primer, lee dipper 2.8cc of BLC-2)
20 rounds Hornady 174 gr boat tail
20 rounds Speer round nose 180 gr
20 rounds Speer soft point 180 gr
Alright, so now begins the fun. The factory load was to be my control. I measured all of them and got the average OAL and diameter. I basically dissected the bullet to get a feel for what standard i was looking for. Of course, I would build up with this knowledge. Then there was the range...the factory loads went everywhere. I was using paper plates (9 inch circumference) at 100 yards, bench rested. I COULD NOT GET A SINGLE GROUPING

Then on another plate, i started shooting handholds. To note, the boat tails felt more "predictable" in terms on shooting, and the soft points coming in close second. the round noses seemed to have a weird pattern of grouping low...more on that later.
To make this even more quirky, i also had an idea on playing with the OAL, so long as it did not exceed the max OAL. I understand SMLE have VARIOUS chamber sizes and thus, OAL is hard to gauge for them, how ever, i appears that mine is a little blown out but short. i noticed that all rounds would fit right into the breech just fine, but the length of the bullet on some would prevent the bolt from properly closing. Of course, ejected, set aside. How does this relate? The shorter rounds (75.4 i believe was my estimated average), seemed to be the best. I did not really take too much note on the round noses because i felt that id most likely be loading boat tails and soft points, but i will still retain the data for later use.
Now for the humorous part. I decided "Hey, why not go Olympic shooting with this bad girl?" So, I stood up and shot 100m with an SMLE. And what do you know, ACURRATE GROUPINGS!!!

I took groupings of 5 soft point and 10 boat tail. The soft point scored an AMAZING 1/12 grouping, while the boat tail scored 3" groupings. How i did this better than bench rested with factory ammo, I don't know, i guess it was Pit love (inside joke for any Marines reading this). i continued to send rounds benched after finding this out with the same results as standing.
Now to Questions of a newbie part, now that we got the mad science out of the way. WTH was going on with the factory loads? was i maybe the way the powder ignites or maybe the way the cases expanded? Im trying to figure out how those groupings came to be so foul. I will try to retest to see if it replicates.
As for the handloads, I believe I know what I must do; for the 174 gr, slowly back down so its a minimum load, slow it down a little so its not spreading as much. the soft points are my scalpel rounds lol. Ultimately, I do wish to make my rifle a shooter, and see what I can do i competition shoots. I do like the BLC-2, and will probably try another powder, but i think BLC will be my standard. Im using the Win. Magnum primers, making a good combo with the BLC, but any other suggestions? She may be old, but she isn't taking age into account.
Do want to make a shout out to Inspector and the crew at the range. With out the help of those projectiles and priceless advice, wouldn't have any clue as to what I was doing. Was great getting range time with you guys!