... data set of something like shot velocities or group sizes that had bullet weight, brand, brass brand, primer ...
I don't believe anyone on THR has done such a comprehensive accuracy testing using a machine rest platform like the Ransom Rest.
For my retirement project, I am in the process of building a hybrid pistol/carbine machine rest (I thought about buying a Ranson Rest but can't mount carbines/PCCs) which, if consistent enough, will be used for 25/50 yard testing of various projectiles, powders, primers, brass referencing well established accuracy standards of "known" accurate loads.
I have found that load testing can get quite extensive as shown in this thread for just a few carbine load testing -
https://www.thehighroad.org/index.p...n-9mm-40s-w-45acp.799231/page-4#post-10338994
And if you are factoring reloads using range brass with different case wall thickness, there are many variables that will taint the testing data as expressed in this myth busting thread -
https://www.thehighroad.org/index.p...neck-tension-and-bullet-setback.830072/page-4
And there are many more reloading variables that will taint the testing data as listed in this post which I am myth busting one by one -
https://www.thehighroad.org/index.p...-and-discussions.778197/page-10#post-10966692
And our latest reloading/shooting variable group project is listing Max/Working OAL for particular barrels with specific bullet -
https://www.thehighroad.org/index.p...let-max-working-oal-col-for-reference.848462/
So, this may not be what you are looking for but American Rifleman has been doing 25/50 yard Ransom Rest testing of various pistols and ammunition with velocity and group sizes for you to reference -
http://www.americanrifleman.org/handguns/semi-auto/
Here's a short listing of their testing for your review:
Nighthawk Custom Hi-Power (25 yards) 0.74" to 1.71" -
https://www.americanrifleman.org/articles/2017/4/11/tested-nighthawk-custom-hi-power/
EAA Witness Elite 1911 (25 yards) 0.82" to 1.41" -
https://www.americanrifleman.org/articles/2017/5/5/tested-eaa-witness-elite-1911-polymer-pistol/
Lipsey's Vickers Tactical Glock 17 (25 yards) 1.00" to 1.80" -
https://www.americanrifleman.org/articles/2017/3/23/tested-lipsey-s-vickers-tactical-glock-17/
Ruger PC carbine (50 yards) 1.13" to 1.42" -
https://www.americanrifleman.org/articles/2018/1/2/tested-ruger-s-pc-carbine-and-security-9-pistol/
Sig P320 X-Five/VTAC (25 yards) 1.14" to 1.97" -
https://www.americanrifleman.org/articles/2018/8/10/tested-sig-sauer-p320-x-series-pistols/
S&W M&P9 M2.0 Compact (25 yards) 1.22" to 3.64" -
https://www.americanrifleman.org/articles/2017/11/30/tested-smith-wesson-mp9-m20-compact-pistol/
Remington R1 M1911 (25 yards) 1.24" to 2.99" -
https://www.americanrifleman.org/articles/2011/1/13/the-remington-r1-m1911/
KRISS Vector Gen II SDP 9 (25 yards) 1.33" to 1.53" -
https://www.americanrifleman.org/articles/2016/7/19/tested-kriss-usa-vector-gen-ii-sdp-9-mm-pistol/
S&W M&P9 M2.0 (25 yards) 1.33" to 2.36" -
https://www.americanrifleman.org/articles/2017/5/22/tested-smith-wessons-mp-m20-pistol/
Sig P225 (25 yards) 1.38" to 2.43" -
https://www.americanrifleman.org/articles/2018/6/22/tested-sig-sauer-p225-a1-nitron-compact-pistol/
Ruger SR1911 Target (25 yards) 1.46" to 3.23" -
https://www.americanrifleman.org/articles/2017/1/9/tested-ruger-sr1911-target-pistol/
Sig P226 Legion Series (25 yards) 1.58" to 2.36" -
https://www.americanrifleman.org/articles/2016/4/15/tested-sig-sauer-legion-series-p226-pistol/
Ruger Mark IV 22/45 Lite (25 yards) 1.82" to 2.00" -
https://www.americanrifleman.org/articles/2017/3/3/tested-ruger-mark-iv-2245-lite-pistol/
FN 509 (25 yards) 1.88" to 2.06" -
https://www.americanrifleman.org/articles/2017/6/26/tested-the-fn-509-pistol/
H&K VP9SK (25 yards) 1.97" to 2.23" -
https://www.americanrifleman.org/articles/2018/1/5/tested-heckler-koch-s-vp9sk-pistol/
Beretta APX (25 yards) 2.30" to 2.47" -
https://www.americanrifleman.org/articles/2017/7/25/tested-beretta-s-apx-pistol/
CZ P-10 C (25 yards) 2.40" to 3.02" -
https://www.americanrifleman.org/articles/2017/10/6/tested-cz-p-10-c-pistol/
Kimber Camp Guard 10mm (25 yards) 2.41" to 2.69" -
https://www.americanrifleman.org/articles/2018/1/11/tested-kimber-camp-guard-10-pistol/
Springfield XDM 4.5" OSP (25 yards) 2.46" to 2.80" -
https://www.americanrifleman.org/articles/2017/3/21/tested-springfield-xdm-45-osp-9-mm-pistol/
Ruger American (25 yards) 2.48" to 2.89" -
https://www.americanrifleman.org/articles/2015/12/29/tested-ruger-american-pistol/
PSA 1911 Stainless Two-Tone (25 yards) 2.51" to 2.89" -
https://www.americanrifleman.org/ar...to-state-armory-1911-two-tone-premium-pistol/
Walther PPQ M2 Q4 Tac (25 yards) 2.53" to 2.76" -
https://www.americanrifleman.org/articles/2018/1/19/tested-walther-ppq-m2-q4-tac-9-mm-pistol/
Ruger Security 9 (25 yards) 2.63" to 3.15" -
https://www.americanrifleman.org/articles/2018/1/2/tested-ruger-s-pc-carbine-and-security-9-pistol/