RB Rooson
"SMLE or K-31 or other? (Remember both accuracy and speed of operation.......manual bolt actions only please).[/quote]"
Disregarding all the rumors, legends, barracks BS and wishfull thinking the answer lies in what is, or has been used, to win in Match Rifle catagory in HP competition. Bolt actions reign in this catagory and ANY type action that meets the requirements may be used. The National Match Course requires both accuracy and speed of bolt manipulation plus the ability to reload quickly. Discounting the new custom actions available these days you will see M70s, M700s and M1903/M1903A1 actions modified into "match rifle" configuration. What you won't see are SMLE actions, K-31 actions, Ross actions, Mauser actions (occasional a Mauser action is used), Mosin-Nagant actions or any "straight pull" actions modified into "Match Rifle" configuaration, simply because they don't cut it. The different sights on the issue rifles are a moot point here as target sights can be put on all. What are the two important criteria for selection of an action are speed of manipulation and the accuracy potential of the action. What IS used and what ISN"T used should answer the question.
I have used all the mentioned rifles, in military trim, and have conducted several tests to determine the "fastest and most accurate" of them during sustained fired. This consisted of 50 rounds fired in a 5 minute or under time frame. I use an "E" target at 200 yards and require shooting slow enough to hit the target with every shot. I have run this test myself, with other experienced shooters and with inexperienced shooters. Shooting position is either prone or sitting. In every instance the the fastest and most accurate is always the M1903/M103A1/M1903A3 actioned rifles in military trim.
Yes, most shooters with the SMLE will seem get the 1st ten shots off a little quicker (the cock on closing actions seems to always require a little more time to get back on target than with the cock on opening actions) but not much. After the 1st ten shots are gone you will find that it takes just as long to load the magazine with 2 five shot strippers as it does to load any of the other actions twice, so after the first ten shots the advantage of the SMLEs 10 shot mag is negated. I never found that much difference in sustained fire between the SMLEs, the straight pulls and the Mausers (M91s through M98s) with shooters not really experienced with those actions. Given only experienced shooters the M1903s and the SMLEs run nip and tuck in sustained fire with a large target like the E target. Given the same test on an F target (prone silhouette) the accuracy of the M1903s over takes the SMLEs. The Mosin-Nagants and straight handled Mausers always bring up the rear in either test.
If you have ever really watched a practiced soldier or HP shooter with a M1903 action rifle in rapid fire you do not know what smooth, fast and accurate is. Most will use one of two techniques; the knife edge of the trigger finger supported by all the fingers extended and joined will pivit up from the firing position, lift the bolt, slap it to the rear in one smooth motion, the fingers are slightly rotated around behind the bolt knob slapping the bolt forward with the fingers pushing the bolt down in the natural movement while at the same time returning back to the firing position, again one smooth motion. The other technique has the fingers extended and joined turning palm up as the hand comes off the firing grip. the fingers lift the bolt and slap it to the rear, then they rotate around behind the bolt, slap the bolt forward and return to the firing position as in the first technique, two very smooth movements. Both techniques are incredibly fast by an experienced shooter and still quite fast by the inexperienced when correctly taught and used. It is only when a shooter grasps the bolt knob with thumb and fingers that things slow down and get jerky. When the bolt is manipulated correctly with the M1903 neither elbow will come off the ground or from the inside of the knees (prone and sitting) and many times the head is barely moved from the aiming position. From the kneeling or standing positions the action is as fast. In every test I have run the M1903 actioned rifles came out the "fastest" and the most "accurate" (meaning the target was hit with every shot faster than with any other type action).
In reality there is a very fine distinction between any of them in sustained or rapid fire given a military context. The exception being the straight handled Mosin-Nagants and Mausers. I might add that a Mosin-Nagant with the sniper bolt handle isn't too bad in the sustained fire department either.
Larry Gibson